The other obvious negative is it’s size and weight which are inevitable given the specs. It comes in at a hefty 1.78 lb (811g). The zoom range is a bit limiting (28.8 to 56mm equivalent) but it could still easily replace a couple primes you’d otherwise buy and have to carry around and switch out on-the-go.

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The key thing to understand with this lens is that it’s not for full-frame cameras. The most popular and comparable option for full-frame shooters is a 24–70mm f/2.8 zoom lens. Since full-frame cameras have inherently shallower depth of field and better performance at higher ISO, having a f/1.8 constant aperture zoom creates a true equivalent for those of us with cropped-sensor cameras. As noted in some early reviews, full-frame shooters still benefit from a slightly broader focal length zoom range with 24–70mm vs. Sigma’s 28.8–56mm equivalent, but this really levels the playing field and does so affordably. I say affordable given Canon’s version of the 24–70mm f/2.8 is a whopping $2300 while Nikon’s “only” at $1900.

One might think such a lens would be quite soft but early reviews attest to its sharpness and the lens measuring scientists at DxOMark have proof in the numbers. This is a real winner for Sigma and it’s earned my respect for what they can produce.

This comparison table by DxOMark says it all given it’s now the best performing APS-C zoom in their entire database of lenses. It sits above the Canon EF 24–70mm f/2.8L II USM and even my beloved all-white Canon EF 70–200mm f/2.8L IS II USM! That’s amazing.

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UPDATE May 2016: Sigma now offers a telephoto zoom version of the Art series, the Sigma 50–100mm f/1.8 DC HSM Art ($1099). Get both and you’ve effectively got a prime lens for every focal length in the 27 to 52mm and 75 to 150mm range (based on Nikon 1.5x crop factor).

Sigma recently released an APS-C lens that rivals nearly all other zoom lenses I’ve seen in its range, the Sigma 18–35mm f/1.8 DC HSM Art. I haven’t tried it myself but I’m dying to try it on my Canon EOS 7D to see how it performs given the rave reviews.

The 9 rounded aperture blades appear to create pleasing and smooth areas in the out-of-focus areas we lovingly call bokeh. Here’s a video testing it out from f/1.8 to f/16 in a number of conditions:

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Myself, I’d order one now but I’m still thinking of going full-frame in a year or two so I’m hesitating. It’s so damn tempting however. If I had to repurchase my gear tomorrow, a Canon EOS 70D and this lens would be a killer combination for just $2000. Perhaps I’ll get this and hold off on a full-frame for a while!

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Most high-end constant aperture lenses are usually expensive and max out at f/2.8 or f/4. To have one that’s relatively affordable and has a constant max aperture of f/1.8 is literally unheard of. The suggested retail is $1160 but the promotional price is $800. At that price, it’s groundbreaking to say the least and it’s a game changer for those without a full-frame sensor camera.

A picture taken with a 35mm lens on a camera with a full frame sensor, shot at f/2.8 and ISO 200, provides — in terms of depth of field and bokeh — a similar image as shot with the Sigma 18–35mm Art on a APS-C sensor camera with the same shutter speed, f/1.8 and ISO 100. Due to the difference in ISO is also full-frame relationship between cameras, and APS-C cameras wiped away a large part of the difference in signal-to-noise.

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Internal focusing and zoom means the lens doesn’t move in-and-out when you zoom or focus and the front element won’t rotate at all. This is ideal in that it’s more robust, won’t trap sand/dust/dirt and a filter or matt-box attached to the lens won’t rotate on you unexpectedly.

What’s remarkable about this lens is its extremely large and constant maximum aperture. That small f/1.8 value is fantastic as it means a lot of light gets into the lens AND it continues to do so even as you zoom in.

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The Canon mount version is available now but on back order (understandably) and other mounts are coming soon it seems. Below are links to the lens pages on B&H for each of the available mounts. You can be notified when it will be available.

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Let me know what you think of the lens or if you plan to buy one. Find it online at B&H (they ship to Canada affordably but check PhotoPrice.ca).

What it does not have is optical stabilization (OS). This is a little less important at wide angles and fast apertures but it would have been an amazing edition. That said, it would probably push the price above $1000 so it may have been a wise choice by Sigma to keep it priced for the general market. I would suspect a second generation of this lens may have stabilization.

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